@ChrisCox911 here is some info for our 182 (P Model). Maybe it will help you understand weight and balance (W&B) with an example. Foreflight, Garmin Pilot, Gyronimo (iPad) and a few others apps all have decent W&B calculators. For this example I am using Gyronimo.
1200lbs: That maximum amount of weight that can be added to the plane
-475lbs: Your weight
-210lbs: A male CFI weight
-360lbs: 60gals of fuel (plane holds 78gals)
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155lbs: Amount left for tools, backpacks, etc
...so from a "Weight" point of view you would have 155lbs to spare. 60gals of fuel is enough for any of your training flights including your longest solo cross country and that includes enough reserves for day and night flight.
The next part is the "Balance" which is where your center of gravity (CG) will be. In your case, your are right on the edge in the numbers I gave above. If you were to put 62gal instead of 60gal you will bust CG (forward). However if you throw 60lbs in the baggage compartment you can actually fly with all 78gals and not bust...actually it will be easier to fly to as it won't be so crazy nose heavy. You could also take a 170lb passenger in the back seat (but not the 60lbs in the baggage compartment) and also be okay.
So from a W&B point of view and old 182 will work. However if you are training at high altitude (eg .Denver) or very hot locations you'd probably want to reduce the max weight (above) by 10% for a safety margin.
One place where you would like the 182 is your height. The pilot and copilot seats in a 182 slide back forever. In other words you should be able to have legs fit and not be up against the yoke. Not sure if the low wing equivalent (Dakota) is the same or has less seat travel. Also the pilot seat is usually height adjustable so you could crank it all the way down.
I think the single most important issue was already mentioned. The maximum weight in the seat and the seat rails. I would also wonder if the seat rail stops might be questionable. Many old 182's (including ours) have a factory upgrade that basically uses a seatbelt on the floor to also lock the seat in place. If you were flying a 182 at your weight I would think you would want this installed.
The best advice was already given...obtain your 3rd class medical first. Don't just rush it. If you find yourself
answering yes to anything come back here first and run it by the crew and they will tell you if you might need assistance.
My suggestion:
Find a way to fly with someone..any GA plane....with two flights of 45 minutes each. If you are still interested then get your medical. If you are "all in" and have the money to purchase (probably $80K) find a few mechanics and start researching your weight vs the few planes that work and if they are any options. Then learn to fly in your plane and pick a super hot 89lb female CFI
At your height, it might be hard to drop enough weight to get most flight schools to just take you on. But in your own plane with W&B all worked out many CFI's would fly with you. To also be clear, in the end it won't really be much cheaper to learn in your own plane so don't do it for that reason. Do it because you want to control all the variables you can to reach your goal.
Its doable, but the range of options if limited and will be more expensive than the average person getting their pilots license.